CN108228007B

CN108228007B - Acoustic wave touch device and electronic device using same

Info

Publication number: CN108228007B
Application number: CN201810063238.7A
Authority: CN
Inventors: 叶颖隆; 张志鹏
Original assignee: Interface Optoelectronics Shenzhen Co Ltd; Interface Technology Chengdu Co Ltd; General Interface Solution Ltd
Current assignee: Interface Optoelectronics Shenzhen Co Ltd; Interface Technology Chengdu Co Ltd; General Interface Solution Ltd
Priority date: 2018-01-23
Filing date: 2018-01-23
Publication date: 2021-05-04
Anticipated expiration: 2038-01-23
Also published as: TW201933074A; CN108228007A; TWI652610B

Abstract

An acoustic wave touch device includes a flexible circuit board, an ultrasonic sensor and a cover plate for implementing touch operation, the ultrasonic sensor is electrically connected with the flexible circuit board to realize signal transmission, and the ultrasonic sensor is electrically connected to the flexible circuit board to realize signal transmission. The sensor is used for transmitting ultrasonic waves and receiving reflected ultrasonic waves, the flexible circuit board is at least partially located between the ultrasonic sensor and the cover plate, and the flexible circuit board is located between the ultrasonic sensor and the cover plate. A part of the corresponding ultrasonic sensor is formed with an opening, the cover plate and the flexible circuit board are directly bonded by a first glue, the first glue fills the opening and bonds the ultrasonic sensor The part corresponding to the opening. The present invention also provides an electronic device applying the acoustic wave touch device.

Description

Acoustic wave touch device and electronic device using same

Technical Field

The present disclosure relates to touch devices, and particularly to an acoustic wave touch device and an electronic device using the same.

Background

Touch is the most important way for humans to perceive and is the most natural way for humans to interact with machines. Touch devices have been developed and widely used in many fields such as personal computers, smart phones, public information, smart home appliances, industrial control, and the like. In the current touch field, there are mainly resistive touch devices, photoelectric touch devices, acoustic wave touch devices, planar capacitive touch devices, and projected capacitive touch devices.

The sound wave type touch device is a novel man-machine interaction mode, in the existing sound wave touch technology, a sound wave generator can send a high-frequency sound wave to reach the surface of a cover plate, when a finger touches the cover plate, the sound wave on a contact is stopped, then a terminal finds out a sound wave receiver which does not receive the sound wave, determines the coordinate position of the finger based on the position of the found sound wave receiver, and executes corresponding operation based on the coordinate position of the finger so as to realize interaction between a user and the terminal.

In the process of implementing the invention, the inventor finds that the prior art has at least the following problems: in the conventional acoustic wave touch device, the acoustic wave touch device includes a sensing unit for emitting or receiving an ultrasonic wave, a cover plate covers the sensing unit, a touch operation interface in contact with a finger of a user is provided on a surface of one side of the cover plate, a necessary propagation path having a certain distance exists between the sensing unit and the touch operation interface, and the ultrasonic wave inevitably passes through the necessary propagation path in a working process of the acoustic wave touch device. The conventional acoustic wave touch device generally has gaps in the necessary propagation path, air exists between the gaps, and the ultrasonic waves with common frequencies are reflected, refracted and transmitted when encountering the air, so that the intensity of the ultrasonic wave signals is weakened. The ultrasonic wave can pierce through multilayer different media in the process of transmitting from the ultrasonic sensor to the touch operation interface, and a part of the ultrasonic wave can reflect, refract and transmit when in the junction of different media, so that the intensity of the ultrasonic wave signal is weakened, in particular to a flexible circuit board which is relatively complex in structure and internally provided with metal wires, metal blocks and other structures. The decrease of the intensity of the ultrasonic signal will cause the decrease of the touch sensitivity.

Disclosure of Invention

The invention provides an acoustic wave touch device which can effectively avoid attenuation of acoustic waves in a transmission process.

In addition, an electronic device using the acoustic wave touch device is also provided.

The utility model provides an acoustic wave formula touch-control device, includes flexible circuit board, supersound sensor and is used for implementing the apron of touch-control operation, supersound sensor with the flexible circuit board electricity is connected in order to realize signal transmission, and the supersound sensor is used for launching the ultrasonic wave and receives the ultrasonic wave of reflection, the flexible circuit board at least part is located the supersound sensor with between the apron, the part that the flexible circuit board is located between supersound sensor and the apron corresponds the supersound sensor and is formed with an opening, the apron with directly bond through first viscose between the flexible circuit board, first viscose is filled up the opening and bonds the part that the supersound sensor corresponds the opening.

An electronic device applying the acoustic wave touch device comprises a body, wherein the acoustic wave touch device is arranged in the body.

Another acoustic wave type touch device comprises a flexible circuit board, an ultrasonic sensor and a cover plate for implementing touch operation, wherein the ultrasonic sensor is electrically connected with the flexible circuit board to realize signal transmission, the ultrasonic sensor is used for transmitting ultrasonic waves and receiving reflected ultrasonic waves, at least part of the flexible circuit board is positioned between the ultrasonic sensor and the cover plate, an opening is formed in the part of the flexible circuit board positioned between the ultrasonic sensor and the cover plate, the area of the opening accounts for more than 90% of the surface area of the ultrasonic sensor, which transmits the ultrasonic waves towards the cover plate, and the opening is completely filled with a first adhesive, so that at least 90% of the ultrasonic waves transmitted by the ultrasonic sensor to the cover plate only have a first adhesive.

In the acoustic wave type touch device, the flexible circuit board between the ultrasonic sensor and the cover plate is provided with the opening, and the opening is filled with the first adhesive, so that in the process of transmitting the ultrasonic waves to the cover plate from the ultrasonic wave transmitting unit, the medium penetrated by the ultrasonic waves is mainly the first adhesive, the medium penetrated by the ultrasonic waves is single, the attenuation degree of the ultrasonic waves is weak, and the touch sensitivity is high.

Drawings

Fig. 1 is a schematic cross-sectional view of an acoustic wave touch device according to a first embodiment of the invention.

Fig. 2 is a partial plan view of a flexible circuit board of an acoustic wave touch device according to a first embodiment of the invention.

FIG. 3 is a schematic view of an electronic device using an acoustic wave touch device according to a preferred embodiment of the invention.

Fig. 4 is a schematic cross-sectional view taken along line IV-IV of fig. 3.

Description of the main elements

Acoustic wave touch device	100
		Flexible circuit board	110
The first part	116
		Opening of the container	112
Electrical connection sheet	120
		Ultrasonic sensor	102
Ultrasonic receiving unit	130
		Ultrasonic wave transmitting unit	140
Cover plate	160
		First piezoelectric sheet	131
Second piezoelectric sheet	141
		A first electrode	132
Second electrode	133
		Third electrode	142
A fourth electrode	143
		First surface	1311
Second surface	1312
		Third surface	1313
Fifth surface	1411
		The sixth surface	1412
The seventh surface	1413
		The first adhesive	151
Second adhesive	153
		Third adhesive	154
Electronic device	10
		Body	101

The following detailed description will further illustrate the invention in conjunction with the above-described figures.

Detailed Description

In order to make the disclosure more complete and complete, reference may be made to the accompanying drawings, in which like references indicate identical or similar elements, and to the various embodiments of the invention described below. However, it will be understood by those of ordinary skill in the art that the examples provided below are not intended to limit the scope of the present invention. In addition, the drawings are for illustrative purposes and are not drawn to scale.

The acoustic wave touch device can be applied to electronic devices such as personal computers, intelligent telephones, intelligent household appliances, industrial controllers and the like.

The following describes the acoustic wave touch device and the electronic device according to the present invention with specific embodiments.

As shown in fig. 1, in the embodiment, the acoustic wave touch device 100 includes a flexible circuit board 110, an ultrasonic sensor 102, an adhesive, and a cover 160. The adhesives include different types, i.e., a first adhesive 151, a second adhesive 153, and a third adhesive 154. The flexible circuit board 110 is wound around the ultrasonic sensor 102 and electrically connected to the ultrasonic sensor 102 to realize signal transmission, and one surface of the ultrasonic sensor 102 covered by the flexible circuit board 110 is combined with the cover plate 160 through the first adhesive 151.

In this embodiment, the ultrasonic sensor 102 includes an ultrasonic receiving unit 130 and an ultrasonic transmitting unit 140. The ultrasonic receiving unit 130 and the ultrasonic transmitting unit 140 are stacked and bonded together by a third adhesive 154, and the third adhesive 154 is an insulating adhesive. The side of the ultrasonic receiving unit 130 away from the ultrasonic transmitting unit 140 is bonded to the flexible printed circuit 110 by the second adhesive 153, and is thereby electrically connected to the flexible printed circuit 110. The flexible circuit board 110 extends along the side of the ultrasonic sensor 102 to a side of the ultrasonic transmitting unit 140 away from the ultrasonic receiving unit 130, and is bonded to the side of the ultrasonic transmitting unit 140 away from the ultrasonic receiving unit 130 through the second adhesive 153, so that the ultrasonic transmitting unit 140 is electrically connected to the flexible circuit board 110.

The ultrasonic wave receiving unit 130 includes a first piezoelectric sheet 131, a first electrode 132, and a second electrode 133. The first piezoelectric sheet 131 includes a first surface 1311, a second surface 1312, and a third surface 1313, the first surface 1311 and the third surface 1313 being disposed opposite to each other, and the second surface 1312 substantially perpendicularly connecting the first surface 1311 and the third surface 1313 and being located between the first surface 1311 and the third surface 1313. The second electrode 133 completely covers the first surface 1311 and the second surface 1312 of the first piezoelectric sheet 131, and extends from the second surface 1312 to the third surface 1313 to partially cover the third surface 1313. The first electrode 132 is disposed on the third surface 1313 and spaced apart from the second electrode 133, i.e., there is no contact between the first electrode 132 and the second electrode 133.

The ultrasonic wave transmitting unit 140 has the same structure as the ultrasonic wave receiving unit 130, and includes a second piezoelectric sheet 141, a third electrode 142, and a fourth electrode 143. The second piezoelectric sheet 141 includes a fifth surface 1411, a sixth surface 1412 and a seventh surface 1413, the fifth surface 1411 and the seventh surface 1413 are disposed opposite to each other, and the sixth surface 1412 is substantially perpendicularly connected to the fifth surface 1411 and the seventh surface 1413 and is located between the fifth surface 1411 and the seventh surface 1413. The fourth electrode 143 completely covers the fifth surface 1411 and the sixth surface 1412 of the second piezoelectric sheet 141, and extends from the sixth surface 1412 to the seventh surface 1413 to partially cover the seventh surface 1413. The third electrode 142 is disposed on the seventh surface 1413 and spaced apart from the fourth electrode 143, i.e., there is no contact between the third electrode 142 and the fourth electrode 143. The fourth electrode 143 of the ultrasonic wave transmitting unit 140 covering the fifth surface 1411 is bonded to the second electrode 133 of the ultrasonic wave receiving unit 130 covering the first surface 1311 by the third adhesive 154.

The flexible circuit board 110 is provided with electrical connection pads 120 corresponding to the first electrode 132 and the second electrode 133 on the third surface 1313, and corresponding to the third electrode 142 and the fourth electrode 143 on the seventh surface 1413, respectively. The portions of the first electrode 132 and the second electrode 133 covering the third surface 1313 are electrically connected to the corresponding electrical connection sheets 120 through the second adhesive 153; the portions of the third electrode 142 and the fourth electrode 143 covering the seventh surface 1413 are electrically connected to the corresponding electrical connection sheet 120 through the second adhesive 153.

Referring to fig. 2, a portion of the flexible printed circuit 110 extending to a side of the ultrasonic wave emitting unit 140 away from the ultrasonic wave receiving unit 130 is defined as a first portion 116, and the first portion 116 is located between the cover plate 160 and the ultrasonic sensor 102. An electrical connection pad 120 corresponding to the third electrode 142 and an electrical connection pad 120 corresponding to the fourth electrode 143 are formed on the first portion 116. An opening 112 is formed on the first portion 116 of the flexible printed circuit 110 corresponding to the ultrasonic wave emitting unit 140. The opening 112 penetrates through the first portion 116 of the flexible circuit board 110 to expose the ultrasonic wave emitting unit 140, and expose the seventh surface 1413 and the third electrode 142 and the fourth electrode 143 on the seventh surface 1413. The opening 112 is located at a substantially central position of the first portion 116, in this embodiment, the opening 112 is located between the electrical connection sheet 120 corresponding to the third electrode 142 and the electrical connection sheet 120 corresponding to the fourth electrode 143, and a gap between the third electrode 142 and the fourth electrode 143 corresponds to the opening 112. The area of the opening 112 occupies 90% or more of the area of the seventh surface 1413 of the second piezoelectric sheet 141. In this embodiment, the opening 112 is rectangular, and in other embodiments, the opening 112 may also be circular, oval, diamond, hexagonal, or other shapes that meet the requirements. The first electrode 132, the second electrode 133, the third electrode 142, and the fourth electrode 143 are made of metal, such as copper, silver, gold, or magnesium-aluminum alloy. The first piezoelectric sheet 131 and the second piezoelectric sheet 141 may be formed of a piezoelectric ceramic material, such as lead zirconate titanate. The material of the electrical connection sheet 120 is metal, and can be copper, silver, etc. The third adhesive 154 may be an insulating adhesive or a conductive adhesive, and when the third adhesive 154 is a conductive adhesive, the fourth electrode 143 and the second electrode 133 may be connected. The second adhesive 153 is an adhesive having a conductive ability, and may be an adhesive filled with metal particles, or a conductive adhesive containing silver.

The cover plate 160 is disposed on a side of the ultrasonic sensor 102 close to the ultrasonic wave emitting unit 140, and is bonded to the flexible circuit board 110 by the first adhesive 151. The cover 160 provides a touch operation interface of the acoustic wave touch device 100. The first glue 151 fills the opening 112 and contacts the third electrode 142 and the fourth electrode 143 on the seventh surface 1413 and a portion of the seventh surface 1413 between the third electrode 142 and the fourth electrode 143, i.e., fills a gap between the third electrode 142 and the fourth electrode 143. After the first adhesive 151 fills the opening 112, the first adhesive 151 overflows from the opening 112, and the overflowing first adhesive 151 further covers a side surface of the first portion 116 of the flexible circuit board 110 facing the cover 160, so as to achieve the adhesion between the cover 160 and the ultrasonic sensor 102. The first adhesive 151 is an insulating adhesive, the first adhesive 151 has a directional acoustic impedance, and the material of the first adhesive 151 may be polymethyl methacrylate (PMMA) adhesive or epoxy adhesive.

In conventional configurations, attenuation of ultrasonic waves may occur during transmission from the ultrasonic sensor 102 to the touch sensitive interface. On one hand, a gap exists between the ultrasonic sensor 102 and the touch operation interface, specifically, air exists in the gap between the third electrode 142 and the fourth electrode 143 in the conventional structure, and the ultrasonic wave with the common frequency is reflected, refracted and transmitted when encountering the air, so that the intensity of the ultrasonic wave signal is weakened; on the other hand, the ultrasonic waves penetrate through multiple layers of different media in the process of being transmitted from the ultrasonic sensor 102 to the touch operation interface, and a part of the ultrasonic waves are reflected, refracted and transmitted at the junction of the different media, so that the intensity of the ultrasonic wave signal is weakened. The decrease of the intensity of the ultrasonic signal will cause the decrease of the touch sensitivity.

In this embodiment, the opening 112 is disposed on the first portion 116 of the flexible circuit board 110 located on the transmission path of the transmitted ultrasonic wave, the area of the opening 112 occupies more than 90% of the surface (i.e., the seventh surface 1413) of the second piezoelectric sheet 141 facing the cover plate 160, the opening 112 is filled with the first adhesive 151, and the first adhesive 151 directly contacts the surface of the ultrasonic wave transmission unit 140 facing the cover plate through the opening 112, so that the medium through which the ultrasonic wave penetrates is mainly the first adhesive 151 in the process of transmitting the ultrasonic wave from the ultrasonic wave transmission unit 140 to the cover plate 160. That is, the seventh surface 1413 is a surface of the ultrasonic sensor 102 emitting the ultrasonic waves toward the cover plate 160, and the area of the opening 112 occupies more than 90% of the surface area of the ultrasonic sensor 102 emitting the ultrasonic waves toward the cover plate 160, so that at least 90% of the ultrasonic waves emitted from the ultrasonic sensor 102 toward the cover plate 160 penetrate the medium only with the first adhesive 151. The medium penetrated by the ultrasonic wave is single, reflection, refraction and transmission are reduced, the attenuation degree of the ultrasonic wave is weak, and the touch sensitivity is high.

Referring to fig. 3 and 4, the present invention also provides an electronic device 10, which includes an acoustic wave touch device 100 disposed in a main body 101. In fig. 3, the electronic device 10 is merely an example of a mobile phone, and in other embodiments, the electronic device 10 may also be a personal computer, an intelligent appliance, an industrial controller, or the like. When the electronic device 10 is a mobile phone, the acoustic wave touch device 100 can be set corresponding to a home key of the mobile phone, so that the home key has a function of touch operation.

Hereinbefore, specific embodiments of the present invention are described with reference to the drawings. However, those skilled in the art will appreciate that various modifications and substitutions can be made to the specific embodiments of the present invention without departing from the spirit and scope of the invention. Such modifications and substitutions are intended to be included within the scope of the present invention as defined by the appended claims.

Claims

1. An acoustic wave touch device, comprising a flexible circuit board, an ultrasonic sensor and a cover for implementing a touch operation, the ultrasonic sensor and the flexible circuit board being electrically connected to realize signal transmission , the ultrasonic sensor is used to transmit ultrasonic waves and receive reflected ultrasonic waves, and it is characterized in that: the flexible circuit board is at least partially located between the ultrasonic sensor and the cover plate, and the flexible circuit board is located in the ultrasonic sensor. An opening is formed corresponding to the ultrasonic sensor in the part between the cover plate, the cover plate and the flexible circuit board are directly bonded by the first glue, the first glue fills the opening and the flexible circuit board is directly bonded. Bond the part of the ultrasonic sensor corresponding to the opening, the ultrasonic sensor includes an ultrasonic receiving unit and an ultrasonic transmitting unit, the ultrasonic transmitting unit includes a second piezoelectric sheet, a third electrode and a fourth electrode, the second pressure The electric sheet includes a fifth surface and a seventh surface, the fifth surface and the seventh surface are arranged oppositely, and the fourth electrode completely covers the fifth surface and extends from the fifth surface to the seventh surface surface, the third electrode is disposed on the seventh surface and spaced apart from the fourth electrode, the first adhesive fills the opening and is connected to the third electrode located on the seventh surface in contact with the fourth electrode and a portion of the seventh surface between the third electrode and the fourth electrode, the first glue fills the opening and approaches the cover from the opening One side of the board overflows, and the overflowing first adhesive covers the surface of the flexible circuit board facing the cover plate to bond the cover plate and the ultrasonic sensor.

2 . The acoustic wave touch device of claim 1 , wherein the ultrasonic transmitting unit is closer to the cover plate than the ultrasonic receiving unit. 3 .

3 . The acoustic wave touch device according to claim 2 , wherein the ultrasonic receiving unit comprises a first piezoelectric sheet, and the area of the opening occupies an area of the surface of the second piezoelectric sheet facing the cover plate. 4 . more than 90%.

4 . The acoustic wave touch device according to claim 3 , wherein the ultrasonic receiving unit further comprises a first electrode and a second electrode, the first piezoelectric sheet comprises a first surface and a third surface, 5 . The first surface and the third surface are arranged opposite to each other, the second electrode completely covers the first surface and extends from the first surface to the third surface, the first electrode is placed on the third surface and is spaced apart from the second electrode; the said The fourth electrode covering the fifth surface is bonded with the second electrode covering the first surface of the ultrasonic receiving unit through a conductive adhesive.

5 . The acoustic wave touch device as claimed in claim 4 , wherein the first electrode and the second electrode on the third surface corresponding to the flexible circuit board, and the third electrode and the corresponding seventh surface on the flexible circuit board. 6 . The fourth electrodes are respectively provided with electrical connecting pieces, the parts of the first electrodes and the second electrodes covering the third surface are electrically connected with the corresponding electrical connecting pieces; the parts of the third electrodes and the fourth electrodes covering the seventh surface are electrically connected to the corresponding electrical connecting pieces. The electrical connection piece is electrically connected.

6 . The acoustic wave touch device of claim 1 , wherein the first adhesive is an insulating adhesive. 7 .

7 . The acoustic wave touch device of claim 6 , wherein the first adhesive is polymethyl methacrylate adhesive or epoxy resin adhesive. 8 .

8 . The acoustic wave touch device of claim 1 , wherein the opening is one of a rectangle, a circle, an ellipse, a rhombus, or a hexagon. 9 .

9 . An electronic device comprising a body and a sonic touch device disposed in the body, wherein the sonic touch device is the sonic touch device according to any one of claims 1 to 8 . control device.

10. An acoustic wave touch device, comprising a flexible circuit board, an ultrasonic sensor and a cover for implementing a touch operation, the ultrasonic sensor and the flexible circuit board being electrically connected to realize signal transmission , the ultrasonic sensor is used to transmit ultrasonic waves and receive reflected ultrasonic waves, the flexible circuit board is at least partially located between the ultrasonic sensor and the cover plate, and it is characterized in that: the flexible circuit board is located in the ultrasonic sensor There is an opening in the part between the detector and the cover plate, and the area of the opening accounts for more than 90% of the surface area of the ultrasonic sensor that emits ultrasonic waves toward the cover plate, and the opening is completely filled with the first glue, so that Among the ultrasonic waves emitted by the ultrasonic sensor to the cover plate, at least 90% of the ultrasonic wave penetrates only the first adhesive, the ultrasonic sensor includes an ultrasonic receiving unit and an ultrasonic transmitting unit, and the ultrasonic transmitting unit includes a Two piezoelectric sheets, a third electrode and a fourth electrode, the second piezoelectric sheet includes a fifth surface and a seventh surface, the fifth surface and the seventh surface are arranged oppositely, and the fourth electrode completely covers the fifth surface extends from the fifth surface to the seventh surface, the third electrode is disposed on the seventh surface and is spaced apart from the fourth electrode, and the first glue is filled the opening is in contact with the third electrode and the fourth electrode on the seventh surface and a portion of the seventh surface between the third electrode and the fourth electrode, the seventh surface An adhesive fills the opening and overflows from the opening to the side close to the cover, and the overflowed first adhesive covers the surface of the flexible circuit board facing the cover to bond the A cover plate and the ultrasonic sensor.

11 . The acoustic wave touch device according to claim 10 , wherein the first adhesive is polymethyl methacrylate adhesive or epoxy resin adhesive. 12 .